Is This A Good Overclock?

Nov 4, 2018
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So I have an I5 8600k overclocked to 5.2ghz @1.330v stable. Under Cinebench the CPU sits around 87c and idles aroud 38c (no clue in gaming yet). My question is is that a good OC compared to the norm? and do you feel that is safe for day to day use?
(Cinebench Score 1294cb, BTW)

System Specs
■ CPU:
I5 8600k
■ Mobo:
EVGA Z370 FTW
■ Cooler:
Cryorig R1
■ GPU:
EVGA GTX 1070 FTW
■ RAM:
16gb Dominator Platnum 2666mhz
■ PSU:
EVGA 850G+